Re: [rules-users] Design Question

Christie, Blair wrote: > > Does anyone have any examples of using the new 'from' element it is > now common to pass a Hibernate session as a global, to allow 'from' to > pull data from a named Hibernate query. > > > > Would it be good design to store the values for a condition in a > database so they can be changed without having to go into the .drl file? > > > > i.e. > > So instead of .. > > > > Rule "free food" > > when > > Food( $food : name == "hamburger" ) > > $: Person( favouriteFood == $food ) > > then > > System.out.println( $person.getName() + " gets a hamburger" ); > > End > > > > You would have > > > > global Food food //where food is inserted as a global but populated > from a db. > > > > Rule "free food" > > when > > $food : food > > $person: Person( favouriteFood == $food ) > > then > > System.out.println( $person.getName() + " gets a " + > $food.getName() ); > > End > > > > Cheers, > > > > Blair > No that isn't good, due to indexing. If $food changes value without the engine knowing about it, then you get a memory leak. So you have to assert the value. Globals really are for immutable vars or containers to collect results. > > > > > > ------------------------------------------------------------------------ > > _______________________________________________ > rules-users mailing list > rules-users(a)lists.jboss.org > https://lists.jboss.org/mailman/listinfo/rules-users > _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users